Angle drive construction



March 23, 1.948. c. A. Ko-A Y 2,438,291

ANGLE DR IVE CONS TRUCT ION Filed April 15, 1943 BYE I,

ATTORNEY.

Patented Mar. 23., 1948 UNITED STATES PATENT OFFICE ANGLE DRIVE CONSTRUCTION charles A. Koza. Pittsburgh, Pa.. Application April 13, 1943, Serial No. 482,874

This invention relates to power drives and more particularly to drives for angle drills used in drilling holes in places that are otherwise inaccessible to a straight drill. The principal object of this invention is to provide a novel construction for the angle drive which will hold the drive and its driving gears and parts in correct alignment and adjustment.

Another object of this invention is to'provide an angle drill with novel adjusting means for taking up the wear of the moving parts thereof.

Another object of this invention is to so construct the combination and the parts thereof that the parts can be easily assembled and adjusted and taken apart for the lreplacement of Worn parts.

Another object of the invention is to make the combination so that the drill will be self lubrieating.

. 6 Claims. (Cl. i4-423) 2 with holes l spaced circumferentially thereof. This sleeve is assembled with the elbow and its chamber by screwing the parts together untilthe desired adjustment is secured as will hereinafter be presently explained.

Before the sleeve 4 is assembled with the chamber 2 a shaft 8 having a bevel gear 9 on the inner end thereof isinserted therein. This bevel gear is formed with a reduced end I and an overh-anging shoulder II which shoulder bears on the inner end of the sleeve 4. The reduced end Il) is lhollow and has a female thread therein with These and other objects of the invention will be has a shoulder I A:i thereon which engageswlth the illustrated in the drawings, described in the speci.

fication and pointed out in the claims thereof.

In the drawing;

Figure l is the longitudinal transverse section of the drill.

Figure 2 is an enlarged sectional view of the right hand portion of Figure 1.

Figure 3 is an enlarged sectional View of a part of the drill containing a modification of or improvement on the drill shown in Figures 1 and 2, the improvement, including a second elbow and parts associated therewith.v

Figure 4 is a bottom plan view of the drill shown in Figure A3 on the same scale used in Figure 1 and showingthe. second elbow in a random posi# tion.

Figure 5 is atop plan view of the outside-of the elbow of the angle drill shown in Figurev 3 with the second elbow and the sleeve and associated parts thereof removed, the outside threads being covered with a collar. i

In the drawings like reference numerals indicate like parts.

In the drawing reference numeral I indicates the elbow oi the drilly having the two chambers 2 and 3 therein which chambers are shown at right angles to each other although it will be runderstood that the chambers can be placed vat an angle of 135 to each other or any other desired angle. Each of the chambers 2 and 3 has a female thread on the inside thereof. Engaged with the chamber 2 is an extension sleeve 4 which is threaded with a male thread as indicated at 5 and has an extension extending beyond the thread as indicated at 6. Thisl sleeve iSPlOVided fao outer end of the chamber 2 whichkeeps the sleeve from extending too far into the chamber. The inner end of sleeve 6 provides a bearingfor the reduced end Ill of the bevel gear and the outer end of the sleeve provides a bearing for shaft 8 as indicated at I4. As shown at I5 an oil space is provided between a large part of the shaft 3 and the inside of the sleeve in which oil or grease can be held for the purpose of lubrication. The holes 'l are provided so that oil can work out between the sleeve and the housing so that the bevel gear, etc. will be amply lubricated. The extension 6 is enlarged at the inner end to make a sliding iit with the inside of the chamber and when the parts are assembled there is no lost motion. The sleeve 4 and the chamber 2 form a long handle for the tool. f

In the chamber 3 a female thread 20 is provided. A short sleeve 2| is provided having a male thread on the inner end thereof, 'the outer end of the sleeve being formed with a shoulder or iiange 22. In this sleeve is mounted to rotate a bevel gear23 which gear has a reduced end 24 surrounded by shoulder 25 on the back of the gear. The gear 23'meshes with the gear 9 and is driven thereby. The reduced end 24 has a female thread therein and carries a drill holder 26 which has a shoulder 21 onthe outer end thereof, the inner end being reduced and having a male thread thereon which engageswith Ithe female thread in the reduced end 24 of the gear. Before the sleeve 2| is inserted in the chamber 3, the bevel gear and its' reduced end are placed in engagement with the sleeve 2l and the sleeve 2I is then screwed intoV place in the chamber 3.

The direction of the rotation of the bevel gear 23 is normally clockwise and the direction of the rotation in the gear 9 is normally counterclockwise, although it is understood that the direction of these rotations may be reversed. There will bersome tendency of the sleeve 4 and extension 6 to rotate in the same direction with the gear 9 and for the sleeve 2| to rotate in the same direction (to, the` gear 23 which would unscrew them. Tojoffset vor neutralize this tendency the threads that couple the chamber '2 and the sleeve l4, are preferably right hand threads and theY threads that couple the sleeve 2l in the chamber inside' the `chamber 4s ihake's'asiiding fit with Y the 'lower end of the sleeve 32. lThe chamber 48 is threaded on the outside with a left hand thread,

3 are preferably left hand threads, the tendency in each case being to rotate the sleeves inwardly toward the elbow rather than rotate them out away from the elbow. Y. l j The end of each bevel gear 9 and 23!Y is blunt.

Y hand thread. By engaging the threads of theV At the elbowof the drill is placed a ball 73l) held in place by a short screw 3| such as is shown in my prior 'Patent #2,229,509. `Theball can be inserted throughthe Ascrew hole vor can be inserted through'either oneof the chambers. This ball takes the inward'thrust from the bevel gears, the outer thrust being taken by ythe-ends of .the sleeves 4'and'2zl."

vThe parts are lformed preferably in the first instance so'that when the shoulder EIS is lscrewed against the end .of the sleeve 2, the lgear -9 will be in its vcorrect position. The same is also true in the forming ofthe sleeve '21,"the distance between :the/inner end of the sleeve and the shoulder 22 being such that^when the shoulder n22 jabuts against't'he end of the chamber 3 the gear 23 be ina correct position. Asthe lends ofthe sleeves wearthe wear lcan :be taken up by the insertion of a washreither on thefshoulderon the bevelgear `9and` 23 or on the shoulder l3and 22 or the fshoulder 13V and' 22 .can be turned down to compensate *for the wear and'foorrect'the adjustirrent.`

l In'Figures `3` and 4 I have shown za modication of the drillshown in Figuresland 2 the rvmodiflca'tic'm ico-nsisting .of the addition of ian-- other l-a'1i'gfl'e'-so as 'to-make it `into a double angle drill. In this form the' Ashort chamber Vtot is threaded .on the outside'with a male thread'as iridi'cated at "31a 'as `wel-l .as being :threaded :on the inside with" afeinale' thread. .An internal sleeve 32 is providedzwhich `sleeve has a collar .33 formed integrallthereon in the middle thereof. This sleeve is threaded on ,the outside at Athe inner end VaridlisV left smooth vorrthe "outside at theV outer Vend. "It isleftsnioothonthe inside. Abevel gear `'34 is mounted to turnY at one end of the sleeve and afbevelgear 35 ismunted to turn 4at the Y outereiid of the sleeve.y These gears are `coupled togetherina single unit by the stud '3.5 VYwhich iis threaded intokthe reduced end of each of the gears fso' that the' two gears revolve together as a unit Aonithe'fsleve 32, thrs'le'eve 32 forming a bearing thereforf The threaded 4end lof the sleeve :32 Eis screwed lirtcj Ythe chamber 3dV until the collarY Ythereon abiits against theY end `oi? thenehanrber. gilplrig vclr'eiiterhal sleeve vSlis formed. with a -female thread therein whichfthrea'd engages lwith `the ,malethread on therout-side of the'chamber 5a. A secondelbow is provided having a 'bevel gear/4 1 therein with ared-uced end 42 surrounded Y ber 45 of the `elbow4ll` This elbow is also Yliar@- drill willbe .inserted in the tool holder `2li andenA the thread on the chamber 3a being a right hand Ythread. The coupling 31 has a female thread therein, the thread at the top being a right hand Y thread and the thread at the bottom being a left coupling '31 with the threads on the chamber Sla andthe bhamber 48 and turning the coupling 37 in one direction, the ends of the two chambers are brought toward each .other and into abutment with collar 33 by whichthey are spaced apart. .1f

this Ycoupling is loosened the chamber 45 -of the -elbpwr40 can be turned in any direction and .can

then be -clam-pedin place by the coupling 31. l

It -will also be understood that there fieno thread on the outside ofthe kcollar 33. with the parts so assembled a drill Vholder similar @to 2t shown in Figure 2 is .inserted in the reducedlend of the ,gear 42 and isdrivenbythe shaft th'rough the two pairs .of bevel gears,

,The assembly including-,the gears 34 "and 55 vwill be accurately fitted Vin the first place and the .endwise adjustment of the assembly will be made by the-adjustmentTV of the chambers, Thebevel gear 4I can be adjustedendwise by turning .the .sleeve 1.3. The bevelfgear isadjusted by turning .the sleeve 4 and the intermediate Vsecond and third bevel gears 34 and 35 float as a unit between-the gears Sl and,4|, Y y Y In ,Figure 5 I have 'shown' the outside of the elbow shown in Figure 3 which is identical with the elbow shown in Figure 1 except that it -has-al'na'le `thread onthe outsideof the .short chamber.V In Figure 5 I have shown this male thread .covered or lprotected by a collar 5l which collar will be any angle desired Yother than 90 andit will also be understood that with the drill'assemble'd either as a single angle drill or a double angle drill. a

the vrotation of theshaft 8 .will be turned thereby.

k:I claim: Y

1. `In an angle drive the combinati@ of artatii-V Y a .collar on said sleeve` which'is engaged by theV adjacent l.ends of the chambers and by whichthey chambers are spaced apart, and an external sleeve makingV threaded engagement with the twoY adalso having two chambers, ...an internal sleeve connect-ing the adjacent chambers of said elbows,

a iCollar onysaid sleeve, which is lengaged bythe Y j adjacent ends of the chambers and by which the chambers are spaced apart, an external sleeve making threaded engagement with the two adjacent chambers and coupling them together, a ilrst and second bevel gear mounted to rotate in the rst elbow, a third and fourth'bevel gear mounted to rotate in the second elbow, and means for connecting the second and third bevel gears together so that the first bevel gear drives the second, third and fourth bevel gears.

3. In an angle drive the combination of a tubular housing having the form of an elbow with a chamber in each end of the elbow, a second elbow also having two chambers, an internal sleeve connecting the adjacent chambers of said elbows, a collar on said sleeve, which is engaged by the adjacent ends of the chambers and by which the chambers are spaced apart, an external sleeve making threaded engagement with the two adjacent chambers and coupling them together, a first and second bevel gear mounted to rotate in the fir-st elbow, a third and fourth bevel gear mounted to rotate in the second elbow, means for connecting the second and third bevel gears together so that the rst bevel gear drives the second, third and fourth bevel gears, a shaft for driving the rst bevel gear, and a threaded means for adjusting said shaft and its bevel gear forward or back in its chamber.

4. In an angle drive the combination of a tubular housing having the form of an elbow with a chamber in each end of the elbow, a second elbow also having two chambers, an internal sleeve connecting the adjacent chambers of said elbows, a collar on said sleeve which is engaged by the adjacent ends of the chambers and by which the chambers are spaced apart, an external sleeve making threaded engagement with the two adjacent chambers and coupling them together, a r-st and second bevel gear mounted to rotate in the i'lrst elbow, a third and fourth bevel gear mounted to rotate in the second elbow, means for connecting the second and third bevel gears together so that the nrst bevel gear drives the second, third and fourth bevel gears, a shaft for driving the first bevel gear, a threaded means for adjusting said shaft and its bevel gear forward or back in its chamber, a shaft driven by the fourth bevel gear and a threaded means for adjusting the fourth bevel gear and its shaft forward and back in its chamber.

5. In an angle drive the combination of a tubular housing having the form of an elbow with a chamber in each end of the elbow extending outwardly therefrom, said housing having a female thread at the outer end of one chamber, a long sleeve having a reduced end, said sleevehaving a threaded portion on the reduced end about midway between the ends of the sleeve with the shoulder adjacent said threaded portion, the reduced end of the sleeve engaging in the chamber and having its threaded portion engaged with the female thread of the chamber with which it engages, a bearing inside of the sleeve at the outer end thereof and a bearing at the inner end of the sleeve, said sleeve forming an extension to the chamber to which it is attached and with the chamber forming a handle for the housing.

6. In an angle drive or the like, an elbow, a second elbow having one end articulated ywith but removable from the first mentioned elbow, meshing bevel gears journalled in each elbow, means connecting the adjacent gears of the two elbows, and means removably securing the articulated elbow to the rst mentioned elbow whereby one of said elbows may be used independently of the other, said last-mentioned means being a coupling sleeve having threaded engagement with both said elbows.

CHARLES A. KOZA.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 543,083 Dahl July 23, 1895 667,465 Seeger et al Feb. 5, 1901 1,244,207 Herreshoil` Oct. 23, 1917 1,278,531 Wallbillich Sept. l0, 1918 1,390,480 Bell Sept. 13, 1921 1,875,529 Vandervoort Sept. 6, 1932 FOREIGN PATENTS Number Country Date 105,599 Great Britain Apr. 15, 1916 799,430 France Apr. 4, 1936 

